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Eddy current experiments with closely placed solid boxes simulating a next step fusion device

Mitsushi Abe, Takehiro Ooura, Akira Doi, Masataka Nakahira, Satoshi Nishio2002年Fusion Engineering and DesignIF 1.7出版社

AbstractEddy current experiments with closely placed solid boxes driven by a coil alternative current were carried out. The experiment was to designed to identify approaches to the problems about: (1) computing accuracy of the eddy current calculation with thin plate approximation; and (2) modeling baselines for a computational study of eddy currents in a super conducting (SC) fusion device. The following conclusions were drawn from experimental data and their comparison with eddy current analyses: (1) the skin effect is a major cause of computational error; (2) if the error due to the skin effect cannot be ignored, the double shell model calculates accurate eddy currents; (3) the mesh size with a narrow gap should be small enough (for example smaller than five times the gap width) so as not to cause additional error. The Finite Element Method (FEM) model for the eddy current computation is well modeled using these conclusions.

日本語訳

渦電流実験を、コイル交流電流によって駆動される密接に配置された固体ボックスを用いて実施した。この実験は、以下の問題に対するアプローチを特定するために設計された:(1) 薄板近似を用いた渦電流計算の計算精度、および(2) 超伝導核融合装置における渦電流の計算研究のためのモデリング基準。実験データと渦電流解析との比較から、以下の結論が得られた:(1) 表皮効果が計算誤差の主な原因である;(2) 表皮効果による誤差を無視できない場合、二重シェルモデルが正確な渦電流を計算する;(3) 狭いギャップを有するメッシュサイズは、追加の誤差を引き起こさないように十分に小さく(例えばギャップ幅の5倍未満に)する必要がある。これらの結論を用いて、渦電流計算のための有限要素法(FEM)モデルが適切に構築された。

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